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Carbon steel and manufacturing method thereof

A manufacturing method and technology of carbon steel, which is applied in the field of high-pressure boiler carbon steel and its manufacturing, can solve the problems of reducing impact resistance, increasing steel timeliness, and steel failure

Inactive Publication Date: 2012-08-08
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too low Alt will cause a certain amount of free nitrogen in the steel, increase the timeliness of the steel, reduce the impact resistance, and seriously cause premature failure of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping amount is 120 to 140 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.08%, the P content is 0.015%, the S content is 0.010%, the Si content is 0.01%, and the Mn content is 0.05%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 133 tons.

[0049] During the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe), which can remove the oxygen content of molten steel to below 0.0020%, and FeSi (Si content is 73%, the rest is Fe, and Si is recycled) to the ladle. rate of 80%)) 550kg and metal Mn (Mn content is 98%, the rest is Fe, Mn recovery rate is 92%) 600kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was ...

example 2

[0055] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping amount is 120 to 140 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.05%, the P content is 0.012%, the S content is 0.011%, the Si content is 0.02%, and the Mn content is 0.03%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 133 tons.

[0056] During the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe) that can remove the oxygen content of molten steel to below 0.0020% to the ladle, and FeSi (Si content is 73%, the rest is Fe) 360kg and Metal Mn (Mn content is 98%, the rest is Fe) 900kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was 0.0018%, and the contents of Si and Mn in the molten steel inc...

example 3

[0062] Add 130 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping amount is 120 to 140 tons), and use the function of the converter to blow oxygen and decarburize the molten iron into molten steel. When the molten steel is initially smelted until the C content is 0.10%, the P content is 0.015%, the S content is 0.008%, the Si content is 0.02%, and the Mn content is 0.04%, the steel is tapped into the ladle. The amount of molten steel after converter smelting is 123 tons.

[0063] In the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe) that can remove the oxygen content of molten steel to below 0.0020% to the ladle, and FeSi (Si content is 73%, the rest is Fe) 700kg and Metal Mn (Mn content is 98%, the rest is Fe) 460kg. After the addition, the actual oxygen content of the molten steel measured by an oxygen meter was 0.0018%, and the contents of Si and Mn in the molten steel increased to 0.35% and 0.38% resp...

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PUM

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Abstract

The invention provides carbon steel and a manufacturing method thereof. The manufacturing method comprises the following steps of: refining liquid steel primarily; tapping from a steel ladle when the carbon (C) content of the liquid steel is 0.05 to 0.10 percent, the phosphorus (P) content of the liquid steel is not more than 0.015 percent and the sulfur (S) content of the liquid steel is not more than 0.020 percent; in the tapping process, adjusting the silicon (Si) content of the liquid steel to be 0.17 to 0.37 percent, the manganese (Mn) content of the liquid steel to be 0.35 to 0.65 percent and the oxygen content of the liquid steel to be below 0.0020 percent; controlling the acid-soluble aluminium (Als) content of the liquid steel to be 0.02 to 0.03 percent; adjusting the oxygen content of the liquid steel to be below 0.0010 percent in a steel ladle refining furnace and adjusting the C content of the liquid steel to be 0.17 to 0.23 percent; and performing circulating vacuum degassing treatment on the liquid steel and adjusting the titanium (Ti) content of the liquid steel to be 0.006 to 0.010 percent so as to obtain the carbon steel. The carbon steel comprises the following elements in percentage by weight: 0.17 to 0.23 percent of C, 0.17 to 0.37 percent of Si, 0.35 to 0.65 percent of Mn, 0.006 to 0.010 percent of Ti, 0.008 to 0.015 percent of Als and the balance of ferrum (Fe) and inevitable impurities.

Description

technical field [0001] The invention relates to a carbon steel and a manufacturing method thereof, in particular to a carbon steel which can be used in a high-pressure boiler and a manufacturing method thereof. Background technique [0002] 20G steel is a typical high-quality carbon structural steel for high-pressure boilers in the Chinese national standard GB5310-2008 (seamless steel pipes for high-pressure boilers), which contains 0.17% to 0.23% of C, 0.17% to 0.37% of Si, 0.35% to 0.65% of Mn, not more than 0.025% of P, not more than 0.015% of S, not more than 0.20% of Cu, not more than 0.25% of Cr, not more than 0.25% of Ni, not more than 0.15% of Mo and V not greater than 0.08%. [0003] Research and production practices have shown that aluminum in steel has a great influence on the quality of 20G steel, and the key to producing 20G steel is how to control Alt (full aluminum) in steel. For example, "Quality Control of 20g High-Pressure Boiler Seamless Pipes" ("Rolling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21C7/00
Inventor 刘明李军杨洪波邓通武陈靓陈建平陈小龙
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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